Version Bump for 3.6.3

./scripts/bump_version.sh --version 3.6.3

Signed-off-by: Minos Galanakis <minos.galanakis@arm.com>
diff --git a/doxygen/input/doc_mainpage.h b/doxygen/input/doc_mainpage.h
index d872818..f903d3f 100644
--- a/doxygen/input/doc_mainpage.h
+++ b/doxygen/input/doc_mainpage.h
@@ -10,7 +10,7 @@
  */
 
 /**
- * @mainpage Mbed TLS v3.6.2 API Documentation
+ * @mainpage Mbed TLS v3.6.3 API Documentation
  *
  * This documentation describes the internal structure of Mbed TLS.  It was
  * automatically generated from specially formatted comment blocks in